Cookies now default to using ~/.erlang.cookie which is automatically
generated if it does not exist when erlang starts with a name.
There is also no longer a need to specify a name to remsh as it'll
generate a name based on the process id and set the short or long
version appropriately.

The race condition in couch_server's ets table usage rears its ugly head
by leaving an entry in couch_lru. This patch just addresses the issue by
allowing the client pid to use the db and ignores the fact that for the
duration its over the max_dbs_open setting.

Due to a bug, older releases allowed the creation of
documents with an empty ID, which are impossible to
GET therefore making the replicator crash.
This change simply skips such documents and logs
an error message to inform users.
This is a backport of revision 1177548 from trunk.
git-svn-id: https://svn.apache.org/repos/asf/couchdb/branches/1.1.x@1177550 13f79535-47bb-0310-9956-ffa450edef68